/** @file
  MiniVisor Cloud Synchronization Library

  This file provides cloud synchronization capabilities for the MiniVisor
  authorization system. Currently simplified to avoid HTTP dependencies.

  Copyright (c) 2024, MiniVisor Project. All rights reserved.
  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#include <Uefi.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include "../../Include/MiniVisorAuth.h"

//
// Cloud sync configuration constants
//
#define CLOUD_SYNC_VERSION                "2.0.0"
#define CLOUD_API_VERSION                 "v2"
#define CLOUD_DEFAULT_SERVER              "https://api.minivisor.com"
#define CLOUD_SYNC_INTERVAL_SECONDS       300    // 5 minutes
#define CLOUD_HEARTBEAT_INTERVAL_SECONDS  60     // 1 minute
#define CLOUD_RETRY_ATTEMPTS              3
#define CLOUD_TIMEOUT_SECONDS             30
#define CLOUD_USER_AGENT                  "MiniVisor-Driver/2.0"

//
// Cloud sync status enumeration
//
typedef enum {
  CloudSyncStatusDisabled = 0,
  CloudSyncStatusConnecting,
  CloudSyncStatusOnline,
  CloudSyncStatusOffline,
  CloudSyncStatusError
} CLOUD_SYNC_STATUS;

//
// Cloud sync context structure
//
typedef struct {
  UINT32                    Signature;
  UINT32                    Version;
  CHAR8                     *ServerUrl;
  CHAR8                     *ApiKey;
  CHAR8                     *DeviceId;
  CLOUD_SYNC_STATUS         Status;
  BOOLEAN                   SyncEnabled;
  UINT32                    SyncInterval;
  UINT64                    LastSyncTime;
  UINT64                    LastHeartbeatTime;
  UINT32                    SyncAttempts;
  UINT32                    ErrorCount;
  EFI_EVENT                 SyncTimer;
  EFI_EVENT                 HeartbeatTimer;
} MINI_VISOR_CLOUD_CONTEXT;

//
// Global cloud sync context
//
STATIC MINI_VISOR_CLOUD_CONTEXT  gCloudContext = {
  .Signature = SIGNATURE_32('C', 'L', 'U', 'D'),
  .Version = 0x00020000,
  .Status = CloudSyncStatusDisabled,
  .SyncEnabled = FALSE
};

/**
  Initialize cloud synchronization system.
  
  @param[in] ServerUrl      Cloud server URL.
  @param[in] ApiKey         API key for authentication.
  
  @retval EFI_SUCCESS       Initialization successful.
  @retval Others            Initialization failed.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudSyncInitialize (
  IN CHAR8  *ServerUrl,
  IN CHAR8  *ApiKey
  )
{
  DEBUG ((DEBUG_INFO, "[CLOUD] Initializing cloud synchronization...\n"));
  
  // Simplified implementation - just mark as disabled for now
  gCloudContext.Status = CloudSyncStatusDisabled;
  gCloudContext.SyncEnabled = FALSE;
  
  DEBUG ((DEBUG_INFO, "[CLOUD] Cloud sync disabled (simplified implementation)\n"));
  
  return EFI_SUCCESS;
}

/**
  Perform cloud synchronization.
  
  @param[in] AuthData       Authorization data to sync.
  @param[in] AuthSize       Size of authorization data.
  
  @retval EFI_SUCCESS       Synchronization successful.
  @retval Others            Synchronization failed.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudSync (
  IN VOID   *AuthData,
  IN UINTN  AuthSize
  )
{
  DEBUG ((DEBUG_INFO, "[CLOUD] Cloud sync requested (simplified - no-op)\n"));
  
  // Simplified implementation - just return success
  return EFI_SUCCESS;
}

/**
  Send heartbeat to cloud server.
  
  @retval EFI_SUCCESS       Heartbeat sent successfully.
  @retval Others            Heartbeat failed.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudHeartbeat (
  VOID
  )
{
  DEBUG ((DEBUG_VERBOSE, "[CLOUD] Heartbeat (simplified - no-op)\n"));
  
  // Simplified implementation - just return success
  return EFI_SUCCESS;
}

/**
  Get cloud sync status.
  
  @param[out] Status        Cloud sync status.
  
  @retval EFI_SUCCESS       Status retrieved successfully.
  @retval Others            Failed to get status.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudGetStatus (
  OUT CLOUD_SYNC_STATUS  *Status
  )
{
  if (Status == NULL) {
    return EFI_INVALID_PARAMETER;
  }
  
  *Status = gCloudContext.Status;
  return EFI_SUCCESS;
}

/**
  Enable or disable cloud synchronization.
  
  @param[in] Enable         TRUE to enable, FALSE to disable.
  
  @retval EFI_SUCCESS       Operation successful.
  @retval Others            Operation failed.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudSetEnabled (
  IN BOOLEAN  Enable
  )
{
  gCloudContext.SyncEnabled = Enable;
  gCloudContext.Status = Enable ? CloudSyncStatusOffline : CloudSyncStatusDisabled;
  
  DEBUG ((DEBUG_INFO, "[CLOUD] Cloud sync %s\n", Enable ? "enabled" : "disabled"));
  
  return EFI_SUCCESS;
}

/**
  Cleanup cloud synchronization resources.
  
  @retval EFI_SUCCESS       Cleanup successful.
  @retval Others            Cleanup failed.
**/
EFI_STATUS
EFIAPI
MiniVisorCloudCleanup (
  VOID
  )
{
  DEBUG ((DEBUG_INFO, "[CLOUD] Cleaning up cloud sync resources...\n"));
  
  // Simplified cleanup
  gCloudContext.Status = CloudSyncStatusDisabled;
  gCloudContext.SyncEnabled = FALSE;
  
  return EFI_SUCCESS;
}
